Typewriting machine



May 26, 1936.

G. F. l-lAmnLl-:Y

TYPEWRITING MACHINE Original Filed Deo. 29, 1934 www mt Patented May 26, 1936 UNITED STATS orricr TYPEWRITING MACHINE George F. Handley, Glendale, N. Y., assignor to Royal Typewriter Company, Inc., New York, N. Y., a corporation of New York This invention relates generally to new and useful improvements in typewriting or like machines, although more particularly to means for removably mounting the platen on the carriage. 'Ihis application constitutes a division of my parent application Serial No. 759,779, filed Dec. 29, 1934, for improvements in typewriting machines.

The principal object of this invention is to provide a quick retractible bearing for the end of the platen shaft opposite the ratchet wheel and which may be easily installed on a commercial carriage without the necessity of slotting the end plate or employing the latch or forming an angular groove in the platen axle as is shown in the Myers Patent 1,496,940, June 10, 1924.

In the drawing:

Figure 1 is a plan view of a portion of a typewriter carriage and platen 'and showing the application of my invention, a portion thereof being shown in section, and

Figure 2 is a front elevation of the structure shown in Figure 1, parts thereof being shown in elevation.

Referring to the accompanying drawing, I have disclosed my invention as being applied to a typewriting or like machine which includes a carriage A having right and left end plates 5 and 6, the latter being provided with the usual laterally extending shelf Located between these end plates and rotatably supported thereon is a readily removable cylindrical platen B.

Journaled in the end plate 6 is a spindle 8 having a handwheel 9 secured thereto. This spindle is held against endwise movement. The inner end of this spindle projects inwardly between the end plates 5 and 6 and fixed on the inwardly projecting end is the usual line spacing ratchet wheel I0 and a cup-shaped clutch element II. 'Ihe inner end of the spindle is provided with an inwardly extending lateral slot I2. The spindle is provided with an axial bore I3 and slidably mounted in this bore is a push rod I4. A stop I5 cooperates with the rod I4 through the medium of a finger-piece I6 tolimit the outward movement of said rod, the rod being normally urged outwardly by a coil spring. Secured to the adjacent end of the platen B is a head I8 havingan outwardly extending hollow boss I9 for receiving the inner end of the spindle 8. The boss I9 is provided with an inwardly extending radial slot 20. A clutch element 2| is supported on the boss I9 for movements toward and from the same by means of pins 22. The clutch element 2| is in the form of a disc and is provided with clutch teeth 23 on its periphery. This the pins 22 to normally and yieldably hold the clutch element 2| in positive driving engagement with the clutch element II whereby the ratchet wheel IG and the platen B will be normally coupled so that line spacing movement imparted to the ratchet wheel by the usual line spacing lever will be transmitted to the platen. The clutch disc 2| is provided with a concentric opening 26 to receive the outer end of the boss I9, and a split disc 21 which is attached to the clutch disc 2| is provided with a tongue 21a which projects radially to the center of said opening. This tongue 2`|a normally projects through the slot 20 of the boss I9 and into the slot I2 of the spindle 8 and into position to be engaged by the inner end of the push rod I4. Upon inward movement of the push rod I4, the tongue 2'|a will be engaged thereby and the clutch element or disc 2| will be moved inwardly toward the platen to thereby disconnect the clutch element and consequently disconnect the platen B from the ratchet wheel II! whereby the platen may be freely rotated in either direction. The above con# struction is all disclosed in the Myers Patent 1,496,940 referred to above.

When it is desired to remove the platen, the right hand end thereof will be disconnected from the end plate 5 of the carriage, the right hand end of the platen will then be swung upwardly until the same clears the end plate 5, and the platen can be readily removed from the carriage.

The right hand end of the platen B is removably supported on the end plate 5 of the carriage by the following means: The end plate 5 is provided with a closed opening 29 and fitted into this opening and rigidly secured to the end plate is an outwardly extending bearing 3U. The adjacent end of the platen B terminates in spaced r-elation to the end plate 5 and rigidly attached to this end of the platen by means of a flange 3|, is a bearing sleeve E having a portion 32 extending outwardly from the platen toward the end plate 5 and an inwardly extending portion 33 positioned in an axial bore 34 formed in the end of the platen. Normally positioned in the alined bearing 30 and sleeve Eis a retractible bearing shaft F for the adjacent end of the platen. By retracting this bearing shaft until the inner end thereof is free from the bearing sleeve E, the adjacent end of the platen will be freed and the platen can then be readily removed. The

outer end of the shaft F is provided with a handwheel 45. In order to normally retain the bearing shaft F in its operative position, I have provided a latch connection between the shaft and the sleeve. To this end, the shaft F is provided with a reducedinner end which is slotted longitudinally as at 59 to form resultant spring clamping arms 60, 6l). The opposed inner faces of these arms are conjointly formed with a transverse seat 6l for receiving a locking pin 44 which extends across the inner end of the bearing sleeve E, the diameter of the seat being substantially equal to the diameter of the pin, and the seat being lolcated intermediate the ends of the slot. Thus when the shaft F is inserted into the sleeve E, the arms E0, 60 will engage the pin 44 and spread slightly until the pin registers with the seat 6| at which time the arms will retract and frictionally retain the shaft against longitudinal movement relative to the platen.

From the foregoing, it will be observed that Whenever it is desired to remove the platen, the right hand end of the platenis first disconnected from the carriage by withdrawing the bearing shaft F, and then the right hand end of the platen is swung upwardly and then bodily removed from the carriage, the construction at the left hand end of the carriage permitting its ready disconnection therefrom.

I claim:

1. In a typewriting or like machine, the combination with a typewriter carriage having end plates, one of said plates having a bearing opening therein, a platen having one end removably supported by the other side plate, a bearing sleeve attached to the other end of the platen and having a transverse pin mounted therein, and a retractible bearing shaft for the last mentioned end of the platen mounted in said side plate opening n and in said sleeve, the inner end of the shaft being transversely slotted to form resultant clamping arms for frictionally engaging said transverse pin.

2. In a. typewriting or like machine, the combination with a typewriter carriage having end plates, one of said plates having a bearing opening therein, a platen having one end removably supported by the other side plate, a bearing sleeve attached to the other end of the platen and having a transverse pin mounted therein, and a retractible bearing shaft for the last mentioned end of the platen mounted in said side plate opening and in said sleeve, the inner end of the shaft being transversely slotted toI form resultant clamping arms for frictionally engaging said transverse pin, the inner faces of said clamping arms being conjointly formed intermediate their ends with a transverse seat for receiving said transverse pin, the diameter of said seat being substantially equal to the diameter of the transverse pin.

GEORGE F. HANDLEY. 

